联于弱交流系统的HVDC故障恢复特性仿真分析

交流系统的强度会影响到高压直流输电(HVDC)的故障恢复速度，而不同的无功补偿方式对交流系统强度有不同的影响程度。文章对目前广泛使用的无功补偿设备，如固定电容(FC)、同步调相机(SC)、静止无功补偿器(SVC)及静止无功电源(SVG)在HVDC故障恢复过程中的作用进行了仿真分析。仿真结果表明SC及SVG能够增强交流系统，因此故障切除后HVDC可以较快地恢复；但SVC在故障恢复期间减弱了交流系统的强度，因此会延缓整个系统的恢复过程，甚至有可能引起后继的换相失败。

SIMULATION AND ANALYSIS OF RECOVERY CHARACTERISTICS OF HVDC CONNECTED TO AC SYSTEM WITH WEAK STRENGTH

The recovery speed of HVDC system is strongly influenced by the strength of AC power system to which the HVDC is connected, however, the influences of differentreactive power compensators on the strength of AC powersystem are not the same. The impacts of the widely usedreactive power compensating devices, e.g., fixed capacity (FC), synchronous compensator (SC), static var compensator (SVC) and static var generator (SVG), on the recovery process ofHVDC are simulated and analyzed. The research results show that SC and SVG strengthen the AC power system and better recovery characteristics of HVDC system can be obtained after the fault cleared. But with the application of SVC, the recovery process of the whole system will be slowed down due to its negative influence on the strength of AC power system, and the successive commutation failures may even occur.